在传统方法的基础上加入了Flex布局并阐述各方法的优缺点，希望对大家有所帮助。先上目录：
- 两列布局：左侧定宽，右侧自适应
- 方法一：利用float和负外边距
- 方法二：利用外边距
- 方法三：利用position
- 方法四：利用flex布局
- 三列布局：左右定款，中间自适应。
- 方法一：使用负外边距
- 方法二：使用绝对定位
- 方法三：使用flex布局
两列布局：左侧定宽，右侧自适应
方法一：利用float和负外边距
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> *{ margin: 0; padding: 0; } .main,.sitebar{ font: bolder 20px/300px; } .main{ width: 100%; float: left; } .main .content{ margin-left: 200px; background-color: red; } .sitebar{ width: 200px; float: left; background-color: green; margin-left: -100%; } </style></head><body> <div class="main"> <div class="content">右侧主体自适应区块</div> </div> <div class="sitebar">左侧定宽200px区块</div></body></html> -
优点：考虑了页面优化，右侧主内容区先加载，左侧后加载。
-
缺点：多添加了一层div包裹。
方法二：利用外边距
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> *{ margin: 0; padding: 0; } .sitebar{ float: left; width: 200px; background-color: green; } .content{ background-color: red; margin-left: 200px; } </style></head><body> <div class="sitebar">左侧定宽200px区块</div> <div class="content">右侧主体自适应区块</div></body></html> -
优点：代码简洁，便于理解
-
缺点：不利于页面优化，右侧主内容区后加载
方法三：利用position
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> *{ margin: 0; padding: 0; } .sitebar{ width: 200px; background-color: green; } .content{ position: absolute; left: 200px; right: 0; top: 0; background-color: red; } </style></head><body> <div class="content">右侧主体自适应区块</div> <div class="sitebar">左侧定宽200px区块</div></body></html> -
优点：考虑到了页面优化，右侧内容区先加载
-
缺点：暂时没想到。。
上述三种方法兼容 IE7以上，但在IE7下不设置高度时，会产生高度错位bug。可通过设置父元素 font-size=0，再分别设置 子元素font-size解决。
方法四：利用flex布局
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> *{ margin: 0; padding: 0; } .main{ display: flex; } .content{ flex:1; background-color: red; } .sitebar{ flex:0 0 200px; order:-1; background-color: green; } </style></head><body><div class="main"> <div class="content">右侧主体自适应区块</div> <div class="sitebar">左侧定宽200px区块</div></div> </body></html> -
优点：CSS3新布局方式，高大上
-
缺点：仅支持 IE11+。
三列布局：左右定款，中间自适应。
方法一：使用负外边距
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title> <style> *{ margin: 0; padding: 0; } .main,.left,.right{ height: 300px; font: 20px/300px; color: #fff; text-align: center; } .main{ width: 100%; float: left; } .main .content{ margin: 0 300px 0 200px; background-color: black; } .left{ width: 200px; float: left; margin-left: -100%; background-color: red; } .right{ width: 300px; float: left; margin-left: -300px; background-color: blue; } </style></head><body> <div class="main"> <div class="content">中间主体区域宽度自适应</div> </div> <div class="left">左侧定宽200px</div> <div class="right">右侧定宽300px</div></body></html> -
优点：兼容IE7+，考虑到页面优化，中间内容区先加载
-
缺点：多一层div嵌套，不易理解
方法二：使用绝对定位
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title><style>body{ margin:0px;}#left { background-color: #E8F5FE; border: 1px solid #A9C9E2; height: 400px; width: 100px; position: absolute; top: 0px; left: 0px;}#center { background-color: #F2FDDB; border: 1px solid #A5CF3D; height: 400px; margin-right: 102px; margin-left: 102px;}#right { background-color: #FFE7F4; border: 1px solid #F9B3D5; height: 400px; width: 100px; position: absolute; top: 0px; right: 0px;}</style></head><body> <div id="center">中列</div> <div id="left">左列</div> <div id="right">右列</div></body></html> -
优点：代码结构简单，考虑到了页面优化，中间内容去先加载
-
缺点：暂时没想到。。
方法三：使用flex布局
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title><style>.HolyGrail-body { display: flex; flex: 1;}.HolyGrail-content { flex: 1; background-color: green;}.HolyGrail-nav, .HolyGrail-ads { /* 两个边栏的宽度设为12em */ flex: 0 0 200px; background-color: blue;}.HolyGrail-nav { /* 导航放到最左边 */ order: -1; background-color: grey;}</style></head><body> <div class="HolyGrail-body"> <main class="HolyGrail-content">...</main> <nav class="HolyGrail-nav">...</nav> <aside class="HolyGrail-ads">...</aside> </div></body></html> -
优点：高大上
-
缺点：仅支持IE11+
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